Cutting-bit for drilling-machines



(No Model.)

J.T;SNYDER. CUTTING BI'I FDR DRILLING MACHINES. No. 513,541.

Patented Jan. 30, 1894,

1 7 &

229161 (la/Ln 81156252" JOHN T. S -NYDER, OF LUZERNE, PENNSYLVANIA.

CUTTING-BIT FOR DRILLING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 513, 541, dated January30, 1894..

' Application filed February 18, 1893, $erial No. 462.863. (No model.)

To aZZ whom it may concern.-

Be it known that I, JOHN T. SNYDER, a citizen of the United States,residing at Luzerne, in the county of Luzerne and State of Pennsylvania,have invented a new and useful Cutting-Bit for Drilling-Machines, ofwhich the following is a specification.

The invention relates to improvements in cutting bits for drillingmachines.

The object of the present invention is to improve the construction ofthe cutting bits shown and described in Patent No. 444,026, granted meJanuary 6, 1891, and Patent No. 492,118, granted me February 21, 1893,to facilitate drilling by decreasing the friction at the bit, and toenable the side cutter to be readily sharpened without removing it orchanging its position.

The invention consists in the construction and novel combination andarrangement of parts hereinafter fully described, illustrated in theaccompanying drawings and pointed out in the claims hereto appended.

In the drawings-Figure 1 is a perspective View of a cutting bitconstructed in accordance with this invention. Fig. 2 is a longitudinalsectional view, the center cutter being shown in elevation. Fig. 3 is atransverse sectional view. Fig. 4 is a detail perspective View of theside cutter.

Like numerals of reference indicate corresponding parts in all thefigures of the drawlugs.

1 designates an auger having a tip 2, to which are secured, by atransverse bolt 3, a central cutter 4 and a reversible side cutter 5.The central cutter 4 is arranged in a slot 6 of the tip 2 and isprovided at its inner end with a V-shaped notch 7, adapted to fitagainst a beveled portion 8 at the inner end of the slot, the portion 8being oppositely beveled and preventing the central cutter turning onthe transverse bolt 3. At a point intermediate of its ends and inadvance of the opening 9 for the bolt 3, the center cutter is providedat its edges with lugs 10, Which fit against the opposite faces of thetip to relieve the bolt of strain. The front end of the central cutteris slightly twisted and beveled to provide a cutting edge 11; and it iscut away and beveled at 12 at the center or longitudinal axis of thecentral cutter in order to relieve that sidefrom friction and to obtainthe same diameter of cut at one-half the friction, as only one side ofthecentral cutter is employed.

The side cutter, which is secured to the tip by the transverse bolt 3,is provided with perforations 13 to permit an adjustment, and it isprovided with inwardly curved end portions 14 having a pitch coincidingwith the twist of the auger. This arrangement of end portions enablesthe side cutter to be continually sharpened without detachment by filinguntil the entire curved portions are Worn away, as each curved portionor any remaining part of the same will always lie in the proper positionrelative to the auger for cutting. I The side cutter, by following thetwist of the auger or drill, may not only be advantageously sharpenedWithout removing it, but

its durability is also greatly increased as any portion of it willalways present a beveled edge to the surface of a hole. The straightconnecting portion 16 of the side cutter is pro vided with pairs ofopposite lugs 17 to engage the tip of the auger or drill and take thestrain from the bolt 3.

It will be seen that the operation of drilling is facilitated, and thatthe side cutter may be readily sharpened by filing from time to timeuntil the entire curved portions are Worn away, without detaching it.

Changes in the form, proportion and the minor details of constructionmay be resorted to without departing from the principle or sacrificingany of the advantages of this invention.

What I claim is- 1. The combination of an anger having a straightlongitudinally disposed edge at its outer end, a reversible andadjustable side cutter provided with a series of adjusting perforationsand havinginwardly extending lugs arranged in pairs and receiving thestraight edge of the auger between them, a bolt arranged in one of theperforations and securing the side cutter to the auger, and a centercutter, substantially asdescribed.

2. The combinationwith an auger provided at its front end with a slotand having an oppositely beveled portion at the inner end of the slot,of a center cutter arranged in the slot and provided at its inner endwith a V- shaped notch engaging the oppositely beveled positely'beveledportion at .the inner end of the slot, of a center cutter arranged inthe slot and provided at its inner end with a V- shaped notch engagingthe oppositely beveled portionof the auger, said center cutter beingprovided with opposite lugs engaging the auger, aside cutterprovided-with opposite lugs and having at each end an inwardly curvedportion conforming to the twist of the auger and following the same,substantially as'described;

5. The combination with an auger provided at its front end with a slotand having an oppositely beveled portion at the inner end of the slot,of acentral. cutter arranged in the slot and provided at its inner endwith a V- shaped notch engaging the oppositely beveled portion of theauger, a bolt securing the cutter to the auger, and the side auger,substantially as described.

In'testimony. that I'claim the foregoing as my ownl have hereto affixedmy signaturein the presence of two witnesses.

JOHN T3" SNYDER;

Witnesses:

W. G. WEAVER, W. S. PARSONS.

